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Organization, Basis of Presentation, and Summary of Significant Accounting Policies Floor Financing (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Floor Financing Accrual [Roll Forward] |  |
Balance at beginning of year | $ 104 | $ 0
Add: Additions to flooring provision | 4,288 | 3,407
Less: Flooring paid | (4,275) | (3,303)
Balance at end of year | $ 117 | $ 104

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- Definition Floor Financing + References No definition available. + Details
Name: | mbuu_FloorFinancing
Namespace Prefix: | mbuu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Floor Financing Accrual [Roll Forward] + References No definition available. + Details
Name: | mbuu_FloorFinancingAccrualRollForward
Namespace Prefix: | mbuu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Floor Financing, Payments + References No definition available. + Details
Name: | mbuu_FloorFinancingPayments
Namespace Prefix: | mbuu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Floor Financing, Provision + References No definition available. + Details
Name: | mbuu_FloorFinancingProvision
Namespace Prefix: | mbuu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration